Fix #350: Fix export warnings on Solaris

Author: rtoy

src/code/exports.lisp

@@ -548,6 +548,7 @@
 	   "TTY-TANDEM"
 	   "TTY-XCASE"
 	   "UNIX-TIMES"
+	   "UNIX-DUP2"
 	   "UTSNAME"
 	   "WRITEGRP"
 	   "WRITEOTH"
@@ -1988,6 +1989,7 @@
 	   "ALPHA-FASL-FILE-IMPLEMENTATION"
 	   "SGI-FASL-FILE-IMPLEMENTATION"
 	   "AMD64-FASL-FILE-IMPLEMENTATION"
+	   "ARM-FASL-FILE-IMPLEMENTATION"
 	   "MAKE-UNBOUND-MARKER"
 	   "RETURN-SINGLE"
 	   "BACKEND-PAGE-SIZE"